A 400 Bad Request is an HTTP status code that appears when client-side issues prevent the web server from processing a request. It’s similar to a server saying “I can’t understand what you’re asking for” – making it different from other web server errors where the server knows what you want but can’t deliver it.
Unlike web application errors (500-series) or 404 Not Found errors, a 400 Bad Request indicates that the client sent an invalid or malformed request that the server cannot understand.
Common HTTP errors include issues like:
- Malformed request syntax
- Invalid request message framing
- Deceptive request routing
- Corrupted or you don’t know how to clear browser cache
- Outdated DNS cache
What Causes the 400 Bad Request Error
The most frequent causes of 400 Bad Request errors include:
- Incorrect URL syntax or invalid characters
- Corrupted browser cookies or outdated DNS cache
- Malformed request headers
- Large file uploads exceeding server limits
- Invalid syntax in API requests
- Outdated browser cache causing conflicts
Example
Here’s a typical example of a 400 Bad Request interaction:
Request:
POST /api/users HTTP/1.1
Host: example.com
Content-Type: application/json
{
"user" "john" // Invalid JSON - missing colon
}
Response:
HTTP/1.1 400 Bad Request
Content-Type: application/json
Date: Fri, 25 Oct 2024 11:40:58 GMT
{
"error": "Bad Request",
"message": "Invalid JSON payload"
}
This is a common example of how to fix server 400 errors through proper request formatting. The web application cannot handle the request because the JSON payload is malformed (missing a colon), which causes the error.
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